Supervisory system.



J. G. NULENJ SUPERVISORY SYSTEM.

' APPLICATION FILED 001:.1o,'191o. 1 031 171, Patented Aug. 26, 1913..

4 sums-SHEET 1.

J. G. NOLEN.

SUPBRVISORY SYSTEM.

APPLICATION FILED OOT.10, 1910.

Patented Aug, 26, 1913.

4 SHEET8-SHEBT 2.

Patented Aug. 26, 1913..

4 SHEETS-BEBE! 4.

m m m m M M W unrrnn sr T s PATENT OFFICE.

i l-Mrs G. NOLEN, or New Your, iv. Y., ASSIGNOR To FIRE rrtornccrron DEVELOP- MENT comrmmor NEW some, 11.2., a CORPORATION or MAINE.

sernnv somr SYSTELL.

Specification of Letters Patent.

1910; Serial No. 586,300.

To all whom it may concern: 1

Be it known that I, JAMES G. NOLEN, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Supervisory System, of

which the following is a specification.

My invention relates to supervisory alarm systems such as are employed for indicating.

mit an alarm through an electric circuit, or

to set in operation other transmitting means; or these fluid-pressure-actuated alarm-initiating devicesmay operate to effect indication of abnormal conditions, or to eflect the transmission of a signal, in various other ways.

My invention comprises an improved annunciator device, and various electrical features as hereinafter described and particu larly pointed out in the claims.

The object of my inventionis to improve supervisory alarm systems of the type referred to, and to'make them more reliable, satisfactory and elastic.

I will now proceed to describe my invention with reference to the accompanying drawings, in which I have indicated, more or less diagrammatically, my improved supervisory alarm system, and certain of the apparatus adapted for use therein.

In said drawings: Figure 1 is a general diagram of the system. Fig. 2 shows a side elevation of one of the diaphragm 'contact devices and of a loop of detector piping connected thereto and including one form of impedance device, the impedance devices and a portion of the piping-being shown in section. .Fig. 3 is a view similar to Fig. 2, except thatv an alternative form of impedance device is shown, and except that the diaphragm contact device is 'shownin section. Fig. 4 shows a detail front view of the diaphragm contact device with one plate of the diaphragm chamber removed. Fig.

5 shows'a detail fragmentary view of an annunciato-r adapted for use in the system, one of the annunciator drop mechanisms being shown" in section. Fig. 6 shows a detail fragmentary elevation of one of the annunciator drop mechanisms, showing the shutter in the down or concealed position; and Fig. 7 is a similar view showing the shutter in its 9 up or displayed position. Fig. 8 shows a front elevation of one form of alarm transmitter that may be employed; Fig. 9 shows a side perspective ele 'vation thereof, and Fig. 10 a rear elevation thereof, the back plate or frame plate having been removed, the viewbeing a section on the line m-a" of Fig. 9. Fig. 11 is a detail diagrammatic view' illustrating the connection of a plurality of detector loops to the same signal initiating device. Fig.

-12 is a diagrammatic view illustrating a device for testing the detector tubes.

, Patented Au 26,1913. Original application filed July 23, 1909, Serial No. 509,103. Divided and this application fileclOctober 10,

Referring first to Fig. 1; numerals 1 v designate fluid pressure actuated signalinitiating Or alarm-initiating devices, connected to loops of detector piping, 2, 2; each such loop including, on opposite sides, impedance devices 3, 3, and each loop being connected to the corresponding alarm-initiating contact device, 1, between the impedance devices 3, by a connection 4. 5 designates a battery, and 6 and 7 circuit condu ctors therefrom to the contact devices 1,

said contact devices being connected in series in circuit 6'('. This circuit includes the release magnet, 8, of a clockwork alarmtransmitter, shown in Figs. 8, 9 and 10 and of which 9 and 10, constitute break-wheels or signal-wheels. Wire 6 leads to the frame of the first diaphragm contact device, and

a wire 11 leads from the rear contact, 12, of that contact device, to the frame of-the next contact device; and so on. Each diaphragm contact device also has a front contact, 13, connected by an individual wire, 14, or 15, or 16, etc, to the magnet of a corresponding drop mechanism in an annunciator, indi" cated diagrammatically at 17. The operation of one of the contact devices or alarminitiating devices, 1, will therefore cause the operation of the brgak-wheels of the of the contact device.

alarm transmitter, and will also cause the shutter of the corresponding annunciator drop to rise to displayed osi'tion.

.Referring to Fig. 3, it wlll be seen that the diaphragm contact devices 1 each comprise a front plate, 18, a rear plate, 19, and a flexible diaphragm 20, also a front contact screw 13, and a rear contact screw, 12. Each such diaphragm contact'device is also provided with a restricted or regulated escape or leakage-device, comprising a short glass tube, 21, of very fine bore, set into a cup 22, and normally covered over by a perforate protectingcap, 23.

As shown in Fig. 2, similar tubes, there designated by numerals 24, form efi'ective impedance in the two sides of the loop; or, in lieu of such tubes, coils 25 may be employed, as impedance devices, as shown in Fig. 3. It is not to be understood that the mere coiling of the detector tubing in itself ma-terially increases the resistance to flow through the tubing; what is required, when such impedance devices are employed, is, that there shall be a sufficient length of the detector tubing in such close proximity-to the contact device,andso protected, that leakage or obstruction shall not be likely to occur in such length of the detector tubing or between it and the connection to the contact device 1; and in order to have a sufficient lengthv of detector tubing in close proximity to the contact device, and there- Efore protected to the same extent that such contact device is protected, it is most convenient to coil the pipe. The resistance of this detector pipe to flow of air through it 'issuch that if a few feet of pipe intervene between a break in the pipe and a point at which heat is applied suddenly, or a point at which pressureis to be effective, the leakage at the break willnot prevent operation On the other hand, expansion of the air in the tube at any localized point will cause a sort of wave or pulse of air to pass through the tube, in both directions, so insuring. the operation of the corresponding contact device. Since, however, these waves or pulses of air pressure are often delicate, it is desirable to I localize the effect of them on the diaphragm,

rather than, to permit them to spread out through the diaphragm chamber and lose efiect. To thisehd, as shown particularly in Figs. 3 and 4, both the diaphragm and the back plate of the diaphragm chamber are deeply csrrugated, and normally the corrugations of the diaphragm lie close on the corrugations of the back plate. The connection 4 from the detector loop leads into one of the grooves in the back plate of the diaphragm chamber. The result of this con struction is that the effect of a pulse of air coming in through connection 4 is at first confined to the groove or corrugation with exceeding a standard rate.

which that pipe 4 connects, the diaphragm, therefore, being moved quickly, so that it is caused to break contact quickly with its rear contact, 12, and to close contact quickly with its front contact, 13.

It is necessary to provide for the introduction of air into the loops of detector pipe, from time to time, in order to testthe loops for responsiveness to rise of pressure To this end, I provide in each such pipe loop a T valve casing, having at one end a screw threaded connection, 26, for a suitable pump, or other testing device, and having within it a valve stem 27 having two valve plugs, 28 and 29, adapted to fit against corresponding seats inthe valve casing. Normally, valve plug 28 prevents escape of air through the open connection 26, and -a spring 30 tends to hold the valve stem in such normal position; but when the pump is applied to the valve casing and air is pumped in through connection 26, the valve stem-is shifted and valve plug 29 then prevents the air so pumped in from passing directly by the shortest path to the 90 diaphragm contact device and forces the air to pass throughout the length of the corresponding loop of detector tubing 2 As shownparticularly in Fig. 1, the circuit conductor 6, after leaving battery 5, passes through the coils of the magnet of annunciator drop 31, and thence passes to the coils of transmitter ma et 8. The annunciator drop 31 differs from the other drops of the annunciator in that its shutter is normally up, that is to say, in position such that the shutter 32,v shows. The breaking of the circuit through this magnet (such as may be occasioned by the breaking of the circuit 67), or material decrease in the 5 strength of current fromthe battery, such as may be occasioned by the battery becoming exhausted, causes this shutter to fall, 1'. e., to move out of sight or to the position in which the other shutters are shown in Fig. 1; for,-as will be explained hereinafter, the magnets of these annunciator drops, when energized, draw their armatures and the shutters connected to them into such position that the shutters are exposed to view; and the principal object of this particular drop 31,'which is termed the O K drop, is to indicate whether circuit 6-7 is complete and the battery 5 supplying a sufiL/ cient amount of current, or whether the cir- I cuit 6--7 is broken or the battery 5 is supplying an insuflicient amount of current. The annunciator drop 31 difl'ersfrom the other drops of the annunciator 17 in that-its armature operates an electrical contact in another circuit to be referred to presently. Such contact is indicated in Fig. 1, by a spring contact member 33, a contact stop 34,. and a push rod 35, shown as arranged to be lifted by the armature 36 of the drop when "Wulttll t said drop is in the normal position, with its shutter 32 displayed. 4

v The signal transmitter comprising magnet 8 and transmitting wheels 9 and 10, will be described hereinafter. For present purposes it is sullicient to understand that this transmitter is of such nature that if the magnet 8 be denergized, or if the current through it be insuflicient to hold the armature of the-magnet retracted, said transmitter will be set in operation and the signal wheels 9 and l0 -will be revolved. Signal wheel 9 is toothed according to the number of the particular station where the detector loops 2 and alarm initiating devicel are located; that is to say, this toothed wheel 9, 'when rotated, causes the transmission through a corresponding circuit of a signal number corresponding to the number for which the wheel is cut. In the particular instance shown in Fig. 1, the wheel is cut to transmit the number 112. The wheel ac- .tuates mechhnically one of the two contact springs, 37 and 38, in a circuit 39-40, lead ing to suitable binding posts, and thence through the externalline to a receiving station not shown. I have not indicated a bat tact springs of each pair being normally separate. These contact devices 4142 and '4344, constitute means for cutting out the annunciator during the first signal round and for closing a shuntacrpss circuit 39-40 after one rotation of the signal wheel 9, in

. case the signal transmitter 1s started in operation through a break in circuit 6-7 or through partial or complete failure of battery 5; and in the closing of this shunt circuit the contact devices operated by the O K drop 31, plays an important part, as will be seen by following the circuit connections. 'The circuit is as follows: from the front contact screw 13 of one of the alarm initiating devices 1 (say, for example, the first of said devices), through the individual annunciator conductor 14 of that alarm initiating device, to the magnet of its cor responding annunciat-ing drop, 45, thence I through a conductor 46 to contact spring44;

"and from the companion contact spring. 43

another conductor 47 passes to the negative pole ofbattery 5; the positive pole of this battery being connected, as :previously explained, through conductorfi, to the frame of the-alarm initiating device 1 to which conductor 14 is connected. Similarly, one terminal of the magnet of each of the other annunciato-r drops, 48 and 49 (corresponding respectively each to one of the other two that, after one rotation of wheel 9, wheel 10.

raises springs-41 and 43 so as to close contact with springs 42 and 44 respectively, and it bein further understood that when circuit 6 is broken, or when battery 5 fails, partly'or completel magnet 31 permits its shutter 32 to fal so causing contacts 33 and 34 to close, it will be seen that the elfect is, to close a shunt across circuit 3940 after one rotation of the signal Wheel 9, so making further operation of the circuit 39-40 by contacts 37 and 38 of signal wheel 9 ineffective; this shunt being as follows: from conductor 39 through conductor 51, contacts 33 and 34, conductor 52, contact springs 42 and 41, and conductor 53' toconductor 40. It will further be seen, that in the normaloperation of the apparatus, that is to say, when circuit 67 is complete, and when the strength of the current from buttery 5 is suflicient to hold the shutter 32 of annun-ciator'drop 31 in its displayed 'posi-- tion, operation obsignal wheel 10 coincidentally with operation of signal wheel 9,

does not cause the closing of shunt-connection across circuit 3940, because at such times the shunt connection through conductors 51, 52, 53 and contact springs 41 and '42, is broken bet-ween contacts 33 and 54 of the annunciator drop 31. The function of contact springs 43 and 44 of this alarm transmitter is as follows: When one of. the alarm initiating devices is operated through expansion of the air in its detector loop 2, so causing the diaphragm in that alarm initiating device to break contact with its rear contact screw 12 and to close contact with its front contact screw 13, the eifect of the breaking of contact of said diaphragm with the rear contact screw 12, is to break the circuit 6 7, so denergizing the magnet 8 of the signal transmitter and starting said transmitter in operation, and so causing signal wheels 9 and 10 to commence rotation.

The effect of the closing of the contact beduring the first revolution of the signal wheel 9, this circuit is broken between contact springs 44 and 43; so that the corresponding annunciator drop is not operated.

vBut at about the conclusion of the first r0- tation' of the signal wheel 9, signal wheel 10 close s contact between springs 43 and 44, and then the circuit just traced through the annunciator drop magnet is completed through spring 43, and conductor 47 to the negative pole of the battery 5, so that at or about the conclusion of one rotation of the signal wheel 9 the annunciator magnet corresponding to that particular alarm-initiating device 1 which has been operated, will be energized and will throw its corresponding shutter into the displayed position. There being therefore, normally a break (between 43 and 44) in the common return 4647, fromthe several annunciator drops, the circuit 67 cannot be short-circuited or the battery 5 exhausted, by an improperly closed circuit through one of the front contacts of the diaphragmcontact devices, or through other similar disturbances. The circuit through one of the annunciator. drops can be closed only while the alarm transmitter is operating. As 'will be explained hereinafter, each one of the shutters of the annunciator drops 45, 48 and 49, corresponding respectively to the three signal initiating devices, when once moved to the displayed position, is held in such position, in-' dependent of the electric circuits, until restored as hereinafter described.

54 in Fig. 1 designates the usual groun connection of signal transmitters operating according to the well known McCullough system; and it will be understood that the signal wheel 9 will also be arranged according to the McCullough system, the purpose of this McCullough system being to insure a signal at the central station even though one side of the circuit from the signal box to the provide for indication of derangement, not

only when the circuit 6'7 isbroken, but also when the battery 5 fails. This advantage I' obtain by providing a normally closed circuit from said battery through the starting magnet 8 of the alarm-transmitter. The resistance of this magnet 8 is very high, so that the normal current from battery 5 amounts to, usually, only one or two milli- 'amperes. I have found that one cell of ordinary dry battery is usually sufiicient for the battery 5, and I have found that a current as low as one or two milliamperes, not only does not appreciably exhaust such a battery, but also thatthebattery remains incondition for service much longer when there is such a slight flow of current from 1t normally, than when the battery is used on open circuit; for dry batteries such as are ordinarily obtainable, are subject, when out of use, that is to say, when on an open circuit, to a progressive deterioration due to internal conditlons; and a slight flow of current from the battery tends to minimize this deterioration. The condition is somewhat similar to that which exists in the well known gravity battery, which, as is well known, works better on closed circuits than on open circuits. U

The annunciator drop mechanism heretofore referredv to is illustrated in detail in Figs. 5, 6 and .7. Each drop comprises a J magnet, as for example, magnet 48, having pivoted in front of its pole piece a curve armature 58 pivoted at 59 and having side pieces 60 carrying the shutter 32. The said armature also carries a hook shaped catch- 61 adapted to beengaged by a latch'pin 62 projecting from the axis shaft 63 of a weight 64, which weight is pivoted outside of the frame plates 65. The arrangement is such that the shutter, once pulled into the displayed position by the action of themagnet, remains locked in such position by engagement of the wire 62- with the hook 61,

until the entire drop mechanism is tilted downward; that is to say, the end carrying the shutter is tilted downward. When this happens, the weight 64 swings to the right of Figs. 6 and 7, (as indicated by adot-anddash line in Fig. 7) so moving the pin out of the path of the hook and permitting the 1 armature to fall by gravity so as to move the shutter to the concealed position shown in Fig. 6. Fig. 7 shows the shutter in the displayed position. 58 is curved eccentrically with reference to its axis of rotation, so that motion of said armature from the position shown in Fig. 6

to the position shown in Fig. 7 moves the face of said armature nearer the pole of the magnet. It'is for this reason that energization of the magnetsuflices to move the armature above the axis from the position shown in F ig. 6 to the position shown in Fig. 7. The armature shutter and side plates 60 constitute in effect one integral structure,

the armature being much heavier than the shutter, and it is. for this reason that the shutter is said to fall when it moves from the position shown in Fig. 7 (the displayed position), to the position shown in Fig. 6

The curved armature (the concealed position) the structure as a whole. falling, though the shutter itself rises. For a similar reason, it is said that the shutter rises when it moves from the position shown in Fig. 6, tho-ugh in fact the shutter itself really falls. Such usage corresponds to present day use of the terms rise and fall in the annunciator art.

Customarily I mount the various annunciator mechanisms in a suitable case, securing the various annunciator mechanisms, end-on to a hingeddoor 66 of this case. As previously explained, the O K"? drop 31, normally has its shutterdisplayed, while the other drops normally have their shutters in the concealed position. So long as none of the signal initiating devices 1 close their annunciator circuits, due to a rise of temperature, in the region through which their respective detector loopspass, the shutters of the drops other than drop 31 will remain concealed; but when onev of the signal initiating devices 1, closes its corresponding annunciator circuit, and starts the signal transmitter in ofperation, then, as previously explained, a ter one rotation of the signal wheel 9 of that transmitter, the circuitthrough the correspondin annunciator drop magnetwill be closed an such magnet, be-

ing energized, will pull its shutter to the displayed position, where such shutter willbe held by engagement of the pin 62 with the catch 61. The shutter thus remains displayed until reset, independent-of whether its corresponding magnet remains energized or not. The resetting is efiected'by swinging downward the door 66 to which the various annunciator drops are attached, for, as shown particularly in Fig. 5, the efi'ect of swinging downward this door is to tilt downward the shutter ends of the annunciator drop mechanism, so permitting-the drop mechanism, the shutter of whichis displayed, to swing so as to trip the correspondingshutter armature and permit 'such armature to drop by gravity and so move its shutter to the concealed position. It may be stated here that the drop mechanism of the O K drop, 31, differs from the mechanisms of the other drops, in that this 0 K drop is not pro vided with the latch 61, weight 64 and locking pin, 62. This is indicated in Fig. '5 by absence of any weight 64 for the upper drop mechanism, corresponding to drop 31 of Fig. 1. Therefore the shutter of this drop.

31 is not restored by swinging downward the door-'66, but instead the shutter ofthis a O K drop, being held displayed by. the

energization of its'magnet 31, remains displayed, and so given a continuous indication that the circuit 6-7 is complete and the battery 5 delivering current of adequate strength, until the circuit -6-7 is broken, or

the battery 5 fails, whereupon the shutterv 32 moves by gravity to its, concealed position. Upon the restoration of the, circuit 67, or u on restoration of full current strength, t e shutter 32, moves, by of attraction of its ma et, back to its displayed position. One important advantage of mounting the 'annunciator dro mechanisms upon a door of a case, and o employing mechanism so arranged that they are restored by the opening of the door and the tiltin downward of such mechanism, is, that there y these drop mechanisms may all be mounted in a water tight case 'Wl'llCh does not require any hole for the passage of a resetting rod or the like. The drop mechanisms may thereby be protected from the efiectsof water, moisture of the air, etc. The door 66 of the case inclosing the an reason nunciator dro mechanisms will customarily I high resistance, so that the flow of current through the circuit 69 is very small; the advantage of which is, as above explained,- that one or two cells of dry battery may supply the current necessary in the circuit, for a long period of time, without material drop 1 in current strength. I have shown the 'cir cuit conductor 7 as. connected to the front contacts of this rela 71, so'that said relay controls the circuit 7 ;'but since the contacts of rela 71 are normally closed, the effect of sai relay on the circuit may be neglected, and has been neglected. heretofore, in considering the. normal operation of the apparatus. If for any reason one of the detector loops 2 should be broken, the circuit 69 will be broken and relay 71 will operate so as to break circuit 6-7, thegeffect of'the breaking of this circuit being to cause the signal transmitter 8 to give a trouble signal as previously explained.

this signal transmitter is illustrated merely as one of numerous transmitters convenlent for the purpose, and is not clalmed as part of this invention. It comprises a magnet 8 having a" pivoted armature 72 arranged to move up and down and so move correspondingly, the. stop arm 73 adapted to engage a notch 74 in the edge of a spring drum 75. The transmitter further comprises a springdriven clock train, the-driving spring (notshown) being within the spring drum 75 and being arranged to be wound by, means of the stem 76 (Figs. 9 and 10). The train com illustrated in Figs. 8, 9 and 10 inclusive,

prises a gear 77 carried by the spring drum 7 5, and various intermediate gears and pinions driving the break wheel 9 and an escapement wheel 78, the motion of WhlCh is controlled by a pallet 7 9 and pendulum 80.

It will readily be seen that when, by the dropping of armature 72, (which has the efl'ect of moving stop arm 73 to the rlght'of Fig. 9) said arm is freed from the notch in the spring drum 75, the clock train starts in operation, rotating the break wheels 9 and 10 and the escapement wheel 7 8, the motlon of the escapement wheel being regulated by the action of the pendulum 80. When, upon restoration of the circuit through the magnet 8, said magnet attracts its armature, as soon as the notch in the spring drum 7:";

'comes opposite the stop arm 73, said arm to engage a corresponding stop 82 carried by the pallet 79. Engagement of these p'ins arrests the vibration of the pallet and so arrests the rotation of the-clock train; but such engagement can occur only when the stop arm 73 has moved into a notch in the periphery of spring drum 75. It will be seen that the operation of this transmitter is such that when the circuit of the'magnet 8 is broken, the stop arm 73 moved out of the notch of the spring drum 7 5, and the pin 81 moves out of engagement with pin 82,

so permitting the clock train to run; and when, after the closing of the circuit of the magnet 8 the stop arm 73 comes opposite the notch in the periphery of the drum 75, said arm '7 3 moves into such notch, and the .pin 81 moves into engagement with pin 82, so arresting the train.

Heretofore it has been common in this art to lead the various detector loops located on different floors of a building, to some one central point. This involves an unnecessary length of detector tubing, making the system less responsive than it should be. In-

stead of so doing, where various detector loops are to be located on difiereut'floors, I

usually locate the signal initiating device for each. detector loop, on that floor of the building where the corresponding detector loop is located, leadingthe circuit conductors from such signal initiating device to a central point in the building. This is indicated in Fig. 1 by the leading of the various circuit conductors to binding posts 67 and 68, the binding posts of each group arranged in proximity to one another. If deshed, a plurality of detector loops may be I loops were ing device.

led to a single initiating device. This is region throu h which any one of these loop: I

runs, has su stantially the same efiect 0n the signal initiating device, as 1f no'otha' connectedto that slgnal initiat- I have heretofore described the testing the loops as being effected by a pump 0on1 nected temporarily to a three way valve,

located in the circuit of the loop, as indicated. particularly in Figs. 2 and 3. It is convenient, however, to employ, instead of the pump, a device actuated directly by rise in temperature, and, preferably, located substantially to the detector, tubing 2, located in a detector loop 2; and in tive proximity to this pipe coil 83, I have provided an electrical heating coil 84, adapted to be connected in anelectric circuit. The resistance of the heating coils 84, and the length of the piping in loop 83, may be (permanently mole loop to be such a device'is illustrated in Fig. 12, and comprises a coil 83 of tubing, corresponding so proportioned as to give the effect of 'a unit rise in temperature over a unit length of detector tubing, as required by the Board of Fire Underwriters when the resistance coils are connected to a standard source of current. This testing device is preferably located within a hermetically sealed and exhausted chamber, 86 (which may be formed of glass or the like) the tubing 83 and the circuit wires passing through and sealed in the walls of the chamber, so that they are protected efiiciently against moisture, dust, etc. Such a device, located in an exhausted chamber, heats up much more rapidly, and so is far more sensitive, than if exposed to air at atmospheric pressure. The heating coil 84 and pipe coil 83 may be wound around an insulating core 87; the pipe coil being of course, spaced away from the re-.

sistance coil. The great advantage of this testing device shown in Fig. 12, as compared with the use of a pump. as heretofore described in connection with Figs. 2 and 3, is that the device shown in Fig. 12 reproduces exactly the minimum conditions under which. the system should give an alarm. The length of tubing in the-coil 83, and the resistance .in the resistance coil 84 will be such that, with a standard current flowing through the resistance coil, the expansion of the air in the coil 83 will just be suflicient to operate the corresponding diaphragm contact device Within the maximum time allowed by the Board of Fire Underwriters. Any leak, however minute, in the pipe, will delay the action of the corresponding diaphragm contact device beyond theallotted period, so indicating positively the existence of aleak; while if, on continuing the flow lengths of detector tubing, so as to give a fair test to a long length of tubing, and at the same time to avoid impairing the diaphragm contact device of a short length of tubing. But the testing means shown in Fig. 12, permanently locatedin each loop of detector tubing, andadjusted to that particular loop, tests fairly its own loop, without exposing the corresponding diaphragm contact device to any excessive pressure. This testing device shown in Fig. 12 also permits very accurate testing of the action of the regulating escape means of the dia phragm contact device, in preventing false alarms; for by passing through the resistance coil' of the testing device. a current which should be just insuflicient' to cause the operation of the diaphragm contact device, if the regulated escape means is operating properly it .will allow sufficient escape I of air to prevent the diaphragm from be-' ing actuated by this insuflicient current; but

on the other hand if the regulated escape? means is obstructed or improperly adjusted to the length of tubing served: by it, then suchweak current may cause the dia-' phragm contact device to operate.

to test such a regulated escape means when pumping in air from a pump; as the action of the pump is not sufliciently uniform, steady, or delicate, The testing device shown in Fig. 12 has the further advantage that under no circumstances will it introduce dust, dirt, or moisture, into the detector tubing; whereas a pump is very apt to do so. i

To exclude dust from the regulated escape means of the diaphragm contact devices illustrated in Figs. 2 and 3, I may provide a layer of porous material 88 (cloth v nal from such, box will comprise several gounds of the box number-usually four or ve. V

The'present application is a division of an application filed July 23, 1909, SrLNo. 509,103, in which I have claimed the combination with fluid pressure actuated means, of a detector pipeloop comprising .im-

. pedance, as hereinbefore described, alsoa It is, very diflicult, if not practically impossible,

mitter having a controlling magnet, anormally closed circuit including said magnet 39 and contact means of said signal initiating device or devices and a source of current supply, and. indicating means in said circuit adapted to indicate interruption of the circuit or material decrease of current flow -33 therethrough, said signal transmitter conrprising transmitting means controlled by said magnet and transmission-preventmg means for preventing transmission of a signal thereby after said transmitting means g has transmitted a predetermined signal, said i dicating means comprising means formaking said signal preventing means operative in case of breakage of said circuit 'or'ma-terial decrease in current flow therethrough.

2. A supervisory signal system comprising in combination one or. more alarm initiating devices having contact means, a signal transmitter having a controllin magnet, a' normally closed circuit inclu ing said magnet and contact means of said signal, initiating device or devices anda source of current supply, and indicating means in said circuit adapted to indicate interruption of the circuit or material decrease of current flow therethrough, said signal transmitter com prising transmitting means controlled by said ma et and shunting contact means for preventing transmission of a signalthereby after said transmitting means has transmit- 11o ted a predetermined signal, a normally open shunt connect-ion connecting such shunt contact means across the contacts of said signal transmitting means, said indicatin means comprising means controlling suc shunt connection and arranged to close same in case of breakage of saidcircuit or material decrease of current flow therethrough.

3. A supervisory signal system comprising, in combination a plurality of alarm initiating devices having contact means, a signal transmitter having acontrolling magnet, a normally closed circuit including said magnet and contact means of said signal initiating devices and a source of current sup ply, indicating means in said circuit adapted to indicate interruption of the circuit or material decrease of current flow therethrough,- other indicating means and circuit means initiatin devices, said signal transmitter comprislng transmitting means controlled by said magnet and transmission-preventmg means-for vpreventing transmissionof the last mentioned indicating means and arranged to make the same operative after a predetermined period of operation of said transmitting means.

4. In a supervisory signal system, the com bination of one or more lengths of detector tubing and one or more fluid-pressure-actuated contact devices, said lengths of detector tubing each connected to a contact device, a signal transmitter having a controlling magnet, indicating means and a normally closed circuit including saidmagnet, contact means of-said contact device or devices, and a source of current supply, said indicating means arranged to indicate, breakage of said circuit or material decrease of current flow therethrough, a circuit including said de-@ tector tubing and a source of current supply,f and means operated by said last mentioned' in combination a plurality of-alarm ing device ving contact means, a

transmitter having a controlling magnet, a

circuit controlling said magnet and controlled by the contact means of said alarm initiat devices, whereby when one of said alarm initiating devices operates the signal transmitter is caused to operate, an annunciator comprising a plurality of indicating doa vices, one for each such signal initiating device, and a clrcuit connect of each such signal initiat1 A device to a corresponding indicating device'ofthe an'-' 46 contact means-:

nunciator, sa1d:transmitter having contact means controlling the circuits from the sew eral signal initiating devices to-the corresponding indicating devices of the annunciator, which contact means prevents closing of a circuit from one of the signal initiating devices to the annunciator except when the signal transmitter is operating.

In testimony whereof, aifix mysignature a in the presence of two witnesses.

Witnesses JAMES G. NOLEN. i 

